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This is a British 19th Century, Full General Rank Tunic, Pattern 1856-1868: note similar yellow button trim, trim twisted shoulder epaulets, and 'rounded' (not square) collar tips. Rear view is also very similar: All your excessive cuff embroidery escapes me though but it sure looks like a 'dress' uniform for soirées: note also: a very similar collar trim insignia: BOTTOM LINE: if in doubt and somebody's wearing that getup; just stand at attention & !!! DAMN QUICK!! https://stewartsmilitaryantiques.com...30.archive.htm Particularly glad to help, as my daughter directs a museum on donations incl. my interior paint jobs; and truck driving to get new display cabinets as needed! EDIT per Rockstar's post:

On each side of the collar are thickly embroidered star and crown, designating the rank of a full General. On the shoulders are two narrow, twisted gold wire cords secured by two small General's pattern buttons. The beautifully made gilt finished buttons display the backmark of Jennens & Co. London, without the Prince of Wales Plume added in1860 by that firm. I was able to check the backs of the closure buttons,they all match, however the cuff and skirt buttons are sewn so closely to the material I can't get a good view of the reverse. you're 'right on the button as usual Rockstar!